# [2021-05-04] Nylas updates

Source: https://developer.nylas.com/docs/new/v2-release-notes/2021-05-04-nylas-updates/

## Sync Engine

### Bug Fixes

- Improved logging around Exchange service account authentication errors when credentials were unusable.
- Resolved a race-condition where duplicate-named folders get created. The sync process will also now not stop as was previously the case.
- Revoked tokens could previously still be re-used and causing accounts to stop syncing. This has been resolved.

## Scheduler

### Bug Fixes

- When creating multiple scheduling pages asynchronously, numerous errors were encountered related to incomplete removal of old page slugs. This has been corrected.

## API

### Outbox

- Not providing `send_at` param on Outbox send with attachments, will now no longer respond in error.
- Incorrect date format in the `POST /outbox` response object, has been fixed.

### Calendar

- Deleting of a virtual calendar prevents the creation of subsequent new virtual calendars. This is now fixed.
- Improved logging around Google recurring events.

### Dashboard

- EU Nylas Dashboard availability issues. Resolved by increasing some previously set maximum configuration values.